Two class games, each a chain of 20 cards. Every card says "I have" a number and asks "Who has" a fact. The student whose card has the answer reads next, and the last card's question is answered by the first card, so the game goes around the whole room. Pages 1 and 2 are the addition set: numbers 1 to 20, from 1 + 0 up to 10 + 10. Pages 3 and 4 are the subtraction set: numbers 0 to 19, with facts like 13 − 9 and 20 − 8. Every number is on one card only, so only one student ever answers. Page 1 of each set has the rules; page 2 has more ways to play. The cards are numbered in the corner in chain order, and the answer keys write each question's answer.
Hand out the cards before the lesson so students can work out their own answer first. Give the easier cards (the small numbers in addition, the take-away-1 and take-away-2 facts in subtraction) to students who need them, and give two cards to quick students when you have fewer than 20. Time the class and post the time; play again later in the week to beat it. Follow along with the answer key to keep the chain moving.
Play with a few family members by dealing out all 20 cards. Or play alone: lay the cards in a line so each answer comes next, and check with the card numbers in the corner.
This pack supports the following Common Core State Standards for Mathematics:
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Two I Have, Who Has? card sets for a 1st grade class, one for addition and one for subtraction, 20 cards each. A student reads a card out loud ("I have 12. Who has 9 + 6?"), the student with the answer reads theirs next, and the chain goes around the room until it comes back to the first card. Each set uses every number once (1 to 20 for addition, 0 to 19 for subtraction), so exactly one card answers each question. The rules are on the page, with more ways to play: beat the class time, a small group, or lining the cards up alone. In color and in black and white, with answer keys.
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